1785-ME64
1785-ME64

2.2plc的发展历程1969年dec公司按照gm（美国通用汽车公司）的要求研制了世界上*台plc并且在gm公司得到成功的应用。此后公司使plc商品化。plc是专门设计出来用于同继电器产品竞争并逐步取代了传统的继电器。plc作为一种工业计算机，经历了以下几个发展的历程。

1969－1972为*阶段，是plc的初期阶段，在该阶段的各厂家的plc差别很大、没有统一的硬件和软件标准、功能简单、性强，硬件主要以分离元件为主，体积较大、性能较差、可靠性不高。

现货，现货，降降降，火火火，火火火……

现货，现货，降降降，火火火，火火火……

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◆ 企业名称：厦门泰尼电气有限公司

◆ ： 小廖（女士）

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诚信经营，质量为首，服务*，厦门泰尼小廖竭诚为您服务！！！

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